Good job on the workout, April!
As far as cool down, I just do some stretching for 2-3 minutes (depending on the exercise and how vigorous). I know that one time I did a cardio workout, was tight on time, so I just showered and sat in my office for the rest of the day, and I was wicked sore (more than the normal good sore from a workout) for days. So I do at least a little stretch.
Our experience with the license was that we called our insurance and added him to the policy with the learner's, but he was not a "rated" driver (had to pay premium) until he actually got his license. Good luck...I hope you enjoy that process with your son. Our driver's manual said to look at it as a bonding experience